a) Mechanical pupling
b) Kraft pulping
c) Thermomechanical pulping
d) Chemithermomechanical pulping
Answer: d
Explanation: Chemithermomechanical pulping – CTMP is suitable for the middle layer of multi-ply boards. It is because CTMP pulps have a greater long fiber fraction and lower fines fraction than comparable thermomechanical pulping -TMP pulps.
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